Flew back from Iceland into Copenhagen, stayed the night there (didn’t do anything, despite the hotel being in the red-light district).
You can tell when you’re tired - as you stand next to the baggage-reclaim belt for Helsinki, instead of for Reykjavic.
Then took the train back to Hamburg and have had a McD’s and about to have lots of beer, now that it is at a normal price (as opposed to the Scandanavian prices).